Planaxis is a genus of small sea snails, marine gastropod mollusks in the family Planaxidae. Species Species within the genus Planaxis include: Planaxis savignyi Deshayes, 1844 Planaxis sulcatus (Born, 1791) Planaxis suturalis E.A. Smith, 1872 Planaxis virgatus E. A. Smith, 1872 Species brought into synonymy Planaxis (Supplanaxis) Thiele, 1929: synonym of Supplanaxis Thiele, 1929 Planaxis abbreviata Pease, 1865: synonym of Planaxis niger Quoy & Gaimard, 1833 Planaxis acuta Krauss, 1848: synonym of Supplanaxis acutus (Krauss, 1848) Planaxis acutus Krauss, 1848: synonym of Supplanaxis acutus (Krauss, 1848) Planaxis affinis Risso, 1826: synonym of Nassarius incrassatus (Strøm, 1768): synonym of Tritia incrassata (Strøm, 1768) Planaxis akuana Rehder, 1980: synonym of Hinea akuana (Rehder, 1980) Planaxis albersii Dunker, 1853: synonym of Planaxis atropurpurea Récluz, 1843 Planaxis areolatus Lesson, 1842: synonym of Nassarius concinnus (Powys, 1835) Planaxis atra Pease, 1869: synonym of Planaxis niger Quoy & Gaimard, 1833 † Planaxis aulacophorus Cossmann, 1889: synonym of † Hinea fischeri (de Raincourt, 1884) † Planaxis beaumonti Bayan, 1870: synonym of † Supplanaxis beaumonti (Bayan, 1870) (original combination) Planaxis beudantiana Risso, 1826: synonym of Nassarius cuvierii (Payraudeau, 1826): synonym of Tritia cuvierii (Payraudeau, 1826) Planaxis brevis Quoy & Gaimard, 1833: synonym of Planaxis sulcatus (Born, 1778) Planaxis buccinea A. Adams, 1853: synonym of Planaxis buccineus A. Adams, 1853 (nomen dubium) (incorrect grammatical agreement of specific epithet) Planaxis buccinoides Deshayes, 1828: synonym of Planaxis sulcatus (Born, 1778) Planaxis canaliculata Duval, 1840: synonym of Planaxis canaliculatus Duval, 1840: synonym of Planaxis planicostatus G. B. Sowerby I, 1825: synonym of Supplanaxis planicostatus (G. B. Sowerby I, 1825) (incorrect gender agreement of specific epithet) Planaxis canaliculatus Duval, 1840: synonym of Planaxis planicostatus G. B. Sowerby I, 1825: synonym of Supplanaxis planicostatus (G. B. Sowerby I, 1825) Planaxis cingulata Gould, 1861: synonym of Cronia avenacea|Cronia (Usilla) avenacea (Lesson, 1842): synonym of Usilla avenacea (Lesson, 1842) (junior homonym of Planaxis cingulata A. Adams, 1853; Planaxis gouldii E. A. Smith, 1872 is a replacement name.) Planaxis circinatus Lesson, 1842: synonym of Planaxis planicostatus G. B. Sowerby I, 1825: synonym of Supplanaxis planicostatus ' (G. B. Sowerby I, 1825) †Planaxis dautzenbergi Glibert, 1949: synonym of † Stosicia planaxoides (Grateloup, 1838): synonym of † Stosicia buccinalis (Grateloup, 1828) Planaxis decollata Quoy & Gaimard, 1833: synonym of Fissilabia decollata (Quoy & Gaimard, 1833) Planaxis desmarestiana Risso, 1826: synonym of Nassarius incrassatus (Strøm, 1768) Planaxis discrepans Risso, 1826: synonym of Nassarius corniculum (Olivi, 1792) Planaxis donatiana Risso, 1826: